Dental impression guide



@ec. 18,1923. mvww 1. BROWN DENTAL IMPRESS ION GUIDE Filed June 15, 1922 2 Sheets-Sheet 3L INVENTOR Jkaac' Bron 1? m ATTORNEY ience to the patient.

Patented Dec. l8, i923.

ISAAC BROWN, OF

new YORK, n. Y.

DENTAL IMPRESSIQN GUIDE.

Application filed June 13,

To all whom it may concern:

Be it known that I, Isaac Brown, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Dental Impression Guides, of which the following is a specification.

This invention relates. to dentistry and especially to the production of removable bridgework, and has to do with a method and means of practicing dentistry whereby artificial bridges may be more accurately constructed with more comfort and conven- More particularly this invention relates to an improved dental device which I prefer to call an impression guide.

Primarily the object of my invention is to disclose a method and produce a means of practicing modern dentistry and more particularly the construction of removable bridgework; the said means relating to a dental tool, device, or appliance useful as a guide in locating points of support, such as a socket or bridge pin at one end of the bridge and such as a clasp at the other bridge end whereby a bridge may be accura-tely constructed by a dental mechanic without reourrance to the patients mouth for testingand fitting the bridge during the process of its construction; and the said method relating to the manner of using the dental tool which I call an impression guide.

Though, in the following description of my invention, I make use of some known procedures and methods in dental work, such as moulding and casting, I do so for the purpose of illustrating the principles of my in vention and the use of my novel impression guide and for explaining the new methods of molding and casting as employed in the practice of my invention. 7

The accompanying drawings illustrate the manner of using my impression guide and show the construction thereof, and though there is shown a preferred manner of use and structural design of the guide or appliance itself, I claim the right of protection as to all such changes as may properly come within the scope of my invention.

The following figures in the drawings consecutively how the operations step by step whereby removable bridgework is constructed by adental mechanic who brings the bridge toa perfect state of-coinpletion 15322. Serial No. 567,982.

without trying or fitting it to the patients mouth.

Figure 1 illustrates a fragmentary portion of the patients mouth with pier teeth in the gum margin with the edentate space therebetween; and one pier tooth has a socket and the other pier tooth carries a dental clasp, both teeth having been made ready to re ceive plastic molding material. Figure 2 shows a front view of one pier; tooth taken on the line 2-2 for the purpose of illustrating the inlay and socket constructed in the pier tooth to support a removable bridge.

Figure 3 shows. the same tooth possessing the socket in the patients mouth with the dental appliance or impression guide disposed in the socket illustrating the second step in the practice of my invention, this view being a fragmentary part of Figure 1. Figure 4 shows the next step involving the application of plastic moulding material such as plaster of Paris, into the patients mouth over, around, and upon the prepared pier teeth with the impression guide in posi tion, the clasp in position, and the plastic moulding material having been worked and shaped across to fill the edentate space in the gum margin until it covers both pier teeth.

Figure 5 illustrates a fragmentary portion of the mould shown in Figure 4: after having been removed from the patients mouth and placed in upright position, and the impressions left by the appliance or impression guide and left by the'clasp are. clearly observable in this figure. Figure 6 isa view similar to Figure 5, the only difference being that the impression guide has now been removed from the patients mouth and placed in. the impression cavity.

Figure 7 illustrates a full line view in perspective of the ntould shown in- Figures 5 and 6 and the impression guide is shown in position in the mould; and the clasp is shown held in the wall of the impression made by the clasp pier tooth. I

Figure 8 is a view of a finished dummy casting or replica of the patients' tooth and gum structure made of any suitable material, such as plaster of Pa-ris, or it is constructed of liquid artificial stone-or of metal, and the impression guide is shown attached to this casting having become embedded. and attached thereto when the moulded plastic material was poured into the mould Figure 7; and similarly the clasp became-attached to the casting when said material was poured into the mould. The contour, occlusal surface, and general structure details of this.

exact accordance with the patients gum margin, his pier tooth, and the socket heighth from the gum margin.

Figure 11 shows some of the denture parts used in addition to the impression guide which are supplied the trade and used in the practice of the invention.

The Figure 10, a bridge is illustrated in closely spaced relation to the casting and exemplifies its position when removed from the casting after the bridge is completed.

An appliance, which I 1 refer t cail an impressionguide, is used in carrying out the several foregoi gsteps as delineated by the drawings.

1 after a t model. is finished upon which a. mechanic may constructa bridge, then the said impression guide is discerned or thrown away inasmuch as it constitutes no part of the bridge structure or cast model structure. Having completed the cast model by the use of the impression guide which model conforms in every respect to the patients month and pier teetln'the dental mechanic builds a brid' 'e to fit this castmodel whereupon the completed'bridge is in every respect a finished article reac y for insertion into the patients mouth.

A descriptio'n will be given of the impression guide and reference is made to Fig ure 9 which shows it. The guide comp-rises a web or plate on one end of which pro jects a cylindrical boss 16. The web is pref erably rectangular in size a d the boss is made cylindrical. Beta the r 2b and boss are manufactured sufficiently large to fulfill the requirements of the largest dental bridgework, or the impression guide may be mace in several sizes whereby the dental operator selects the size most appropriate for the work at hand. The dental operator cuts off the straight end of the impression guide, cuts away a portion of the boss or otherwise works it down to suit his needs.

After the dental operator has completed inthe usual way an inlay with platinun'i tube socket 21, he thereupon inserts the im pression guide in the sock t as observed in Figure 3. The dental operator plaster of Paris or plastic moulding inat applies terial to the patients month. over the two pier teeth 22 and23, and over the impression guide, over the clasp C, and across the eden tate space as is observed in Fi nre 4t; and this mould 24 is now allowed to set then removed from the patients' mouth and placed in upright position as illustrated in l? i gures 5, 6 and 7. When the mould is removed from the patients month there is formed an impression guide cavity and into this cavity the impression guide'l5-19 is inserted with the boss 16 projecting outwardly into the pier tooth cavity 26 as ch served in Figures 6 and 7 and when the mould 24 is removed. from the patients mouth the clasp C being embeddedin the set plastic material is pulled off the pier J tooth 23 and remains in the mold as shownv in Figures 5, 6, and 7; and the pier tooth cavity 14 is formed in the mold 2st from the patients pier tooth 23. It 18 to be understood that the dental operator mounts a tube 29 on the boss 20 .justbeforc he places the impression guide 15 within the cavity 25 so that the boss 16 is covered withthe tube as shown in Figure 6. At this stage of the procedure the work is turned over to them dental mechanic the patient is disini crl and not required to make a further sitting until a bridge Figure 19 is completely finished to fill theedentate space.

The dental mechanic having received the mould 24 in the condition shown in Figure 7 thereupon immediately casts a model 21' by pourin 'g artificial stone or other suitable material into the mould Figure 7 and upon and around the impression guide and clasp; and amalgam may be used to advantage by packing it into the pier tooth mold cavities 26 and 14 so that the teeth 28 and of the casting will withstandthe wear and tear in building the bridge. il/Vhen the mould 2% is broken and removed from the cas'ting27 there remains the impression guide 15 held in theposition as illustrated in Figure 8 with the boss 16 and the cover tube 29 embedded in the pier tooth casting 28. The impression guide is removed and discarded leaving the tube 29 in the casting whereupon the casting '2'? with the cast pier teeth 29 and 30 are an exact replica to. he patients pier teeth 22 and 23 shown in t, and the tube 29 in the cast g is exa tly the same size and occupies the same relative position asthe socket tube 21 in the patients pier tooth inlay, The casting 27 is an exact replica of the patients gum. margin anditfollows therefore that the heighth of the socket tube 29 and clasp C above the gum margin in and on the casting '27 i'sexactly equal to the height above the patients gum margin of his-socket 21, and equal the a 1 gures lane J sentation of one having been constructed upon the casting 27 to fill the edentate space so that when the said bridge is placed in the patients mouth, the bridge pin 35 properly rests in the socket 21 with the bridge saddle 86 resting in contact with the gum ridge or margin. In a similar manner the bridge clasp C fits with exactitude the patients pier tooth 23 because the said clasp was accurately fitted to the casting pier tooth 30.

The dental mechanic now constructs the bridge Figure 10 upon the casting 27 and so mounts the anchor pin or boss and the clasp that they accurately fit the said casting, and it follows that the bridge will then fit the patients mouth.

Figure 12 shows some additional parts such as a high fusing platinum gold rod 40, a platinum closed bottom tube 41 having an extension part by which it is handled, a carbon rod 42, and the tube 29 which are used in the practice of my invention and the construction of the bridge Figure 10.

What I claim is:

1. That improvement in the method of laying out the position of socket and pin supports for dental bridge work, which comprises the fitting of an appliance into the patients mouth, applying plastic material to obtain a mold possessing an impression of the appliance, removing the appliance and mold from the patients mouth and fitting it into the mold, making a casting in the mold which casting attaches itself to the appliance, removing the appliance from the casting to leave a bridge supporting means on the casting whiclr means is identical in lay-out and design to the patients mouth, and constructing a bridge upon the casting and bridge supporting means.

2. That improvement in the method of laying out the position of pier teeth and bridge sockets and pins in the practice of dentistry, which involves the fitting of an impression guide to a pier tooth, making a mold of the patients mouth of the pier tooth and of the impression guide, removing the mold and impression guide from the mouth, inserting the impression guide in the mold in such a manner that said guide projects into the pier tooth impression to attach the guide to the solidified molten material, removing the impression guide from the cast pier tooth to leave a pin socket, and constructing a bridge to fit the pin socket in the cast pier tooth.

3. That improvement in the method of laying out the position of socket and pin supports on a pier tooth and bridgework and determining the position of a clasp upon a pier tooth in the construction of dental bridges, which comprises the fitting of an appliance into the patients mouth, fitting the clasp onto a pier tooth, applying plastic material to obtain a mold possessing an impression of the appliance and clasp, removing the mold from the patients mouth and removing the appliance from the patients mouth and fitting said appliance into the mold, making a casting in the mold which casting attaches itself to the appliance and clasp, removing the appliance from the casting to leave a bridge supporting means on. the casting which means is identical in layout and design to the patients mouth, and constructing a bridge upon the casting between the bridge supporting means and the clasp.

4. A device useful in the construction of dental bridgework comprising a web to form an impression in a mold, and a boss on the web to fit into a pier tooth socket, and the combination of a pier tooth provided with a socket to receive the boss.

5. An impression guide useful in dental bridgework comprising a web, a boss on the web, and a tube on the boss adapted to slip off the boss and remain as a lining in the socket of a dummy upon which is to be made and fitted a removable bridge to be subsequently installed in the patients mouth.

6. An impression guide comprising a rectangular plate, and a boss made on one end of the plate, said boss being adapted to form a socket in a cast dummy upon which bridgework is constructed.

7. An impression guide in the nature of a tool and useful in constructing a dental bridge after which it is discarded, comprising means such as a plate for forming an open impression in plastic molding material, and a boss made on the means by which the tool may be supported in the socket of a natural tooth while impression material is applied to the mouth, said boss also adapted to form a hole in a dummy device.

In testimony whereof I afiix my signature this 3d day of June, 1922, in the city of New York, State of New York, and county of New York.

ISAAC BROWN.

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